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;;; elenv.el --- Environment variable management -*- lexical-binding: t; -*-
;; Copyright (C) 2022-2023 Shen, Jen-Chieh
;; Author: Shen, Jen-Chieh <jcs090218@gmail.com>
;; Maintainer: Shen, Jen-Chieh <jcs090218@gmail.com>
;; URL: https://github.com/jcs-elpa/elenv
;; Version: 0.1.0
;; Package-Requires: ((emacs "26.1"))
;; Keywords: maint
;; This file is not part of GNU Emacs.
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; The package name `elenv' stands for Emacs Lisp environment.
;;
;; Environment variable management.
;;
;;; Code:
;;
;; (@* "Operating System" )
;;
;;;###autoload
(defconst elenv-windows (memq system-type '(cygwin windows-nt ms-dos))
"The operating system is Microsoft Windows compatible.")
;;;###autoload
(defconst elenv-darwin (eq system-type 'darwin)
"The operating system is GNU-Darwin compatible.")
;;;###autoload
(defconst elenv-macos elenv-darwin
"The operating system is macOS compatible.")
;;;###autoload
(defconst elenv-linux (eq system-type 'gnu/linux)
"The operating system is Linux compatible.")
;;;###autoload
(defconst elenv-bsd (eq system-type 'gnu/kfreebsd)
"The operating system is BSD compatible.")
;;;###autoload
(defconst elenv-unix (memq system-type '(aix berkeley-unix hpux usg-unix-v))
"The operating system is Unix compatible.")
;;;###autoload
(defconst elenv-system-type
(cond (elenv-windows 'dos)
(elenv-macos 'mac)
(elenv-linux 'unix)
(elenv-bsd 'bsd)
(t 'unknown))
"Generic system type.")
;;;###autoload
(defmacro elenv-with-os (os &rest body)
"Evaluate BODY by OS."
(declare (indent 1))
`(when (or (eq system-type ,os) (memq system-type ,os)) ,@body))
;;;###autoload
(defmacro elenv-with-windows (&rest body)
"Evaluate BODY in Windows."
(declare (indent 0)) `(when elenv-windows ,@body))
;;;###autoload
(defmacro elenv-with-macos (&rest body)
"Evaluate BODY in macOS."
(declare (indent 0)) `(when elenv-macos ,@body))
;;;###autoload
(defmacro elenv-with-linux (&rest body)
"Evaluate BODY in Linux."
(declare (indent 0)) `(when elenv-linux ,@body))
;;;###autoload
(defmacro elenv-with-bsd (&rest body)
"Evaluate BODY in BSD."
(declare (indent 0)) `(when elenv-bsd ,@body))
;;;###autoload
(defmacro elenv-with-unix (&rest body)
"Evaluate BODY in Unix."
(declare (indent 0)) `(when elenv-unix ,@body))
;;
;; (@* "Environment" )
;;
;;;###autoload
(defmacro elenv-if-env (variable then &rest else)
"Evaluate THEN if VARIABLE is valid, we execute ELSE if not valid."
(declare (indent 1))
`(if-let ((value (getenv ,variable))) ,then ,@else))
;;;###autoload
(defmacro elenv-when-env (variable &rest body)
"Evaluate BODY when VARIABLE is valid."
(declare (indent 1))
`(when-let ((value (getenv ,variable))) ,@body))
;;;###autoload
(defmacro elenv-unless-env (variable &rest body)
"Evaluate BODY when VARIABLE is valid."
(declare (indent 1))
`(unless (getenv ,variable) ,@body))
;;
;; (@* "Executable" )
;;
(defmacro elenv--exec-find (command remote)
"Find executable COMMAND.
For argument REMOTE, see function `executable-find' description."
(let ((var (intern (format "elenv-exec-%s" command))))
`(if (boundp ',var)
(symbol-value ',var)
(defvar ,var (executable-find ,command ,remote)
(format "Variable generate it with `elenv' finding executable `%s'."
,command))
(symbol-value ',var))))
;;;###autoload
(defmacro elenv-if-exec (command remote then &rest else)
"Evaluate body (THEN and ELSE) if COMMAND is found.
For argument REMOTE, see function `executable-find' description."
(declare (indent 3))
`(if-let ((value (elenv--exec-find ,command ,remote)))
,then
,@else))
;;;###autoload
(defmacro elenv-when-exec (command remote &rest body)
"Evaluate BODY when COMMAND is found.
For argument REMOTE, see function `executable-find' description."
(declare (indent 2))
`(when-let ((value (elenv--exec-find ,command ,remote)))
,@body))
;;;###autoload
(defmacro elenv-unless-exec (command remote &rest body)
"Evaluate BODY unless COMMAND is found.
For argument REMOTE, see function `executable-find' description."
(declare (indent 2))
`(unless (elenv--exec-find ,command ,remote)
,@body))
;;
;; (@* "Graphic" )
;;
;;;###autoload
(defconst elenv-graphic-p (display-graphic-p)
"Return t if graphic mode.")
;;
;; (@* "Debugging" )
;;
;;;###autoload
(defun elenv-debugging-p ()
"Return non-nil when debugging."
(bound-and-true-p edebug-active))
(provide 'elenv)
;;; elenv.el ends here
|
